写出下列符号的意义
1.元素符号
O:________________、________________
N:________________、________________
P:________________、________________、________________
Cu:________________、________________、________________
Ar:________________、________________、________________
3P:________________
2O:________________
5Fe:________________
2He:________________
8Cl:________________
2.化学式
H2O:________________、________________、________________、________________
CO2:________________、________________、________________、________________
2SO2:________________
5H2O2:________________
3.元素符号和化学式意义对比
H:________________、________________
2H:________________
H2:________________、________________、________________、________________
2H2:________________
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